Clamp.



0. H. ARNESON.

CLAMP.

APPLICATION HLED APR.1I. 1914.

Patented Apr. 27, 1915.

THE NORRIS PETERS 60.. PHOTO-LITHQ. W ASHINGTUN u. C

ovE I-I. ARNESON, or ST. PAUL, MINNESOTA.

CLAMP.

Specification of Letters Patent. Patented Apr, 2 7, 1915.

Application filed April 11, 1914. Serial no. 831,201.

of Minnesota, have invented a new and useful Improvement in Clamps, ofwhich the following is a specification. 0

The object of this invention is to prov de a clamp which is adapted foruse in'making square and miter joints. 7

The invention has to do more partlcularly with an ordinary clamp such asis commonly employed by carpenters for drawlng two faces together toform a close and even joint, said clampbeing provided with movablymounted jaws which are adapted to engage the parts of a miter jointuniformly and evenly together and hold them 1n that position untilpermanently vfastened. The jaws also are so arranged that they can bemoved back out of the way leaving the ordinary jaws of the clamp freefor ordinary use.

Further objects of the invention will be apparent from the followingdescription,

and particularly pointed out in the claims.

In the accompanying drawing forming part of this specification, Figure 1is a side elevation of my invention showing the parts of a miter jointsecured by the clamp; Fig. 2 is a side elevation of a detailillustrating one end of one of the aws with its auxiliary jaw insubstantially the same position as illustrated in Fig. 1; Fig. 3 isanother side elevation of a detail illustrating one end of one of thejaws, part of said jaw being broKen away and in section for the'purposeof more clearly illustrating the construction of the invention; Fig. 4:is a'section of a detail taken on the line XX of Fig. 1,v

and Figs 5 and 6 are perspective views of parts of my improvement.

In the drawing, A and B indicate two oppositely disposed jaw members ofan ordinary carpenters clamp which are adapted to be adjusted by meansof the screws 2 and 3 in the ordinary manner. This clamp is adapted foruse in securing the two members together in parallel position in theusual manner. These main jaw members are not adapted for direct use insecuring two faces at an obtuse angle together and for more eiiicientlyaccomplishing this result, I provide a pair of similarly constructedauxiliary jaws G and D, each of which is mounted in one of the main jawmembers A and B. Each auxiliary jaw consists of a metal face plate 4having a supporting rib 5 centrally and longitudinally disposed on oneside, said rib being adapted to be seated 1n a slot. 6 in the main jaw.The lateral face of theplate 4 opposite the side from which the ribprojects is provided with inwardly facing teeth 7 trending inwardly anddownwardly when the plates engage two members of a miter joint such as Gand H illustrated in Fig. 1. IThe rib on the auxiliary jaw member isformed with a lon gltudinal 'slot 8. 'The main jaw members are providedwith pintle members E and F which are similar, one pintlebeing seated oneach main jaw. Each pintle is formed with a yoke 9 integral with twoface plates 10-10, said yoke passing through said longitudinal slot 8 inthe rib of an auxiliary aw and across the slot 6 in a main jaw andacting as a pivot on which the auxiliary jaw is free to slide and hinge.The face plates l010 are secured across the inner face of" the upper endof the main jaw as illustrated such as by screws 11. These face plates1010 serve to reinforce and protect the upper ends of the main jaws fromwear when the jaws are in ordinary use. The pintle member permits theauxiliary jaw, to turn freely either into position for use in securingthe members of a miter joint together, or to swing back out of the wayand against the slanting outer faces 12 on the upper ends of the mainjaws as illustrated in Fig. 3. The upper end of the slot 8 in each rib 5is offset to form a pocket 13 which isadapted to receive the yoke 9 andits shoulders to prevent the auxiliary jaw sliding when in extendedposition. When in extended position the auxiliaryjaw is free to swingonits pintle which rests in said pocket whereby both auxiliary jaws areadapted to adjust themselves so that their inwardly and downwardlyslanting teeth will bite into the material of the members G and H andhold said members closely joined together. The inner side of the slot 8toward the face plate 4: is at a slight angle inwardly toward the lowerend of the inner wall of said face plate, so that a binding engagementis produced between the inner face of said face plate and the inclinedsurface 12 of the main jaw when the auxiliary jaw is swung up and sliddown upon the face 12. This binding engagement as illustrated in Fig. 3holds the auxiliary plate with its ribs receded into the main jaw andits face entirely out of V nary use.

the way leaving the main jaw free for ordiclamp for securing themembersof a miter joint together the auxiliary jaws are moved. outwardly andslid inwardly with their pockets l3'holdingthe pintle yokes-9.. The

i members G and H are then inserted between 7 embodiment" thereof, bjutI desire to have Vsis'ting; of a plate, having'a series. of in- I theface plates of the auxiliary'jaws and the screws-2 and 3 tightened,thuscausing, the

, teeth 7 "toengage the material of the mem' V ber'sG and H and clampsaid members with;

forming a close'joint have described the' principles of operation ofmyinvention, together with the apparatus.

which-InoW consider to represent the best itj understo'iod' that'theconstruction shown is only illustrative, andjthat' the-invention.

can be carried out 'byv other means and ape plied'to uses other thanthose above set forth:

Within'the scope of the following. claims;

Having described my invention; what, claim as new and desire to'protect. byQLet- I ters Patent is 1 for adjusting said jaws apart, anauXiliary jaw carried'j by each" of said nlai v jaws, con- Wardly anddownwardly trending} teeth carried by-its face and a crib on; the backof said plate, said rib beingformedwith a slot. trending at an angle tothe adjacent face of Said'plate and terminating at one end in an offsetpocket, said rib; being movably; seated in the slot infone of said mainjaws andl 'a pintlfe passing across the I space between the sides" ofthe 'slotgi'n each main jaw. and

through the slotjin' the rib of an auxiliary jaw and adapted to form a;pivot forfthe adapted to permit s'aid' auxiliaryjjaw swinging back, overtheupperendof. the main jaw and the trending ofjsaid slot: causing. saidplate to bind with one',of its faces. binding.

against the back of the main jaw.

When it is desired to use the,

clamp, comprising, combination, Pai f. am Jaws fh i ng'. s. 1n subs tialalinementj acrossthe r' outer end's,.means auxiliary jaw,- said pintlemember being 2;A clamp, comprising, in combination, a pair'of mainclamping jaws, means for adjusting. said jaws apart and an auxiliary jawpivoted upon each of said main jaws having a toothed work engagingsurface adapted to lie at an obtuse angle to the working surface of theopposite main jaw and a. slotted. member co-acting with said pivotconnection, permitting said auxiliary jaw swinging and sliding hack freeof the working surface of themain jaw on which it ismounted. r

3.1 clamp, comprising, in combination, a pair. of main clamping jawshaving bifurcated, upper ends, means for adjusting said jaws apart andan. auxiliary jaw slidably engaged within the bifurcated: end of eachof. said main jaws having a work e11- gaging surface adapted to lie atan obtuse angle; to the working surface of the opposite' main jaw or toslide back free of the working, surface of the main jaw onwhich it,is.mount'ed,

4;, clamp comprising a pair of main clamping, jaws having slotstlierethrough, means 011; adjusting said jaws apart, and an auxiliaryjaw slidably engaged] within the slots of each of. said main jawsadapted to adjust itself to and bear against the adjacent face of amiter joint and to be slid back free of the working surfaces of saidmain jaws.

5. A clamp comprising a pair of main clamping jaws having bifurcatedupper ends, a. pivot pin. extending through each of said bi furcated.ends, means for adjusting said jaws apartand an. auxiliary jawslidablyengaged by said pivot pin within the bifurcatedend of each ofsaidmain jaws adapted to operatively engage the adjacent face of'worklying at anangle to the working faces of said main jaws.

In testimony wherof, I have signed my nameto this specification, inthepresence-of two subscribing witnesses.

' O-VE ARNESON. Witness S'rnnLaL. WAsoHnNBEncER, v

Gr- BRADBURY.

Gopi'es'of thi s patent maybefobtained' for five cents. each, by adaressing' the Commissioner of Patents,

j Y i i I Washington, 11 0.

